Results 111 to 120 of about 38,917 (207)

Variational Thermomechanically Coupled Shape Memory Alloy Material Model and Optimization of Shape Memory Alloy Based Out‐of‐Plane Bistable Microactuator

International Journal for Numerical Methods in Engineering, Volume 127, Issue 3, 15 February 2026.
ABSTRACT This work presents a fully thermomechanically coupled material model for shape memory alloys (SMAs), capable of predicting shape memory effect, superelasticity, stress and strain recovery, and martensite reorientation. Formulated within the Generalized Standard Material (GSM) framework, the model employs a rate potential, whose variations ...
Muhammad Babar Shamim, Hauke Goldbeck, Stephan Wulfinghoff   +2 more
wiley   +1 more source

Possible quantum instability of primordial black holes [PDF]

, 1999
Evidence for the possible existence of a quantum process opposite to the famous Hawking radiation (evaporation) of black holes is presented. This new phenomenon could be very relevant in the case of exotic multiple horizon Nariai black holes and in the ...
C. Callan, E. Elizalde, E. Elizalde, H. Nariai, I. L. Buchbinder, J. B. Hartle, M. S. Chanowitz, R. Bousso, R. Bousso, S. D. Odintsov, S. Nojiri, S. W. Hawking, S. W. Hawking   +12 more
core   +2 more sources

Gravitational Wave Bursts from Collisions of Primordial Black Holes in Clusters

, 2010
The rate of gravitational wave bursts from the mergers of massive primordial black holes in clusters is calculated. Such clusters of black holes can be formed through phase transitions in the early Universe.
A. Cattaneo, A. Sesana, C. M. Will, H. Mouri, L. P. Grishchuk, L. Spitzer, M. Mapelli, M. Yu. Khlopov, M. Yu. Khlopov, S. G. Rubin, S. G. Rubin, S. G. Rubin, V. Dokuchaev, V. I. Dokuchaev, Y. Gao, Yu. N. Eroshenko   +15 more
core   +1 more source

Axion Black Hole Solution in Non‐Metricity Gravity

Fortschritte der Physik, Volume 74, Issue 2, February 2026.
Abstract A static, spherically symmetric black hole solution in symmetric teleparallel (non‐metricity) gravity sourced by an axion field is constructed. Starting from the modified field equations, exact configurations are obtained characterized by the mass M$M$ and an axion–geometry coupling β$\beta$, with temporal metric function A(r)=1−2Mr+βr$A(r)=1-\
A. Eid, G.G.L. Nashed
wiley   +1 more source

Exploring primordial black holes and gravitational waves with R-symmetric GUT Higgs inflation

Physics Letters B
This study investigates the realization of R-symmetric Higgs inflation within the framework of no-scale-like supergravity, aiming to elucidate the formation of primordial black holes and observable gravitational waves within a class of GUT models.
Nadir Ijaz, Mansoor Ur Rehman
doaj   +1 more source

Growth of primordial black holes in a universe containing a massless scalar field

, 2005
The evolution of primordial black holes in a flat Friedmann universe with a massless scalar field is investigated in fully general relativistic numerical relativity.
B. J. Carr, B. J. Carr, B. J. Carr, D. K. Nadezhin, D. N. C. Lin, I. D. Novikov, R. M. Wald, S. W. Hawking, T. Harada, Tomohiro Harada, Y. B. Zel’dovich   +10 more
core   +1 more source

Accretion, evaporation and superradiance phase diagram of (primordial) black holes and 10−21 − 1021 eV scalar, vector, tensor fields

Physics Letters B
We obtain the accretion, evaporation and superradiance phase diagram of astrophysical and primordial black holes in the mass range 10−33−1011M⊙. This black hole mass range corresponds to production of 10−21−1021 eV particles for superradiance (bosons ...
Caner Ünal
doaj   +1 more source

Primordial black holes could hold the key to dark matter mysteries. [PDF]

Proc Natl Acad Sci U S A, 2022
Waldrop MM.
europepmc   +1 more source

Primordial black holes within Higgs hybrid metric-Palatini approach

European Physical Journal C: Particles and Fields
In this paper, we investigate the production of primordial black holes (PBHs) during the radiation-dominated era. The collapse of significant density perturbations originating from large primordial scalar fluctuations generated during inflation can lead ...
Brahim Asfour, Farida Bargach, Yahya Ladghami, Ahmed Errahmani, Taoufik Ouali   +4 more
doaj   +1 more source

Primordial black holes in Gauss-Bonnet gravity

Physics Letters B
In this paper, we investigate the production of primordial black holes (PBHs) during the preheating era. Indeed, the amplification of field fluctuations can lead to the amplification of curvature perturbations.
Brahim Asfour, Aatifa Bargach, Yahya Ladghami, Ahmed Errahmani, Taoufik Ouali   +4 more
doaj   +1 more source